Mercury - Oil Pressure Gauge L-H Engine Protection Monitoring White Face Brushed Bezel 79-8M6020072. OverviewThis L-H oil-pressure gauge gives you a steady, no-nonsense read on how the engine's lubrication system is holding up. The needle settles into place with a smooth swing, so any change-big or small-is easy to catch. Out on the water, it feels natural to check it now and then, the same way you'd glance at your trim or depth. It's a simple, dependable gauge that helps you stay ahead of engin